Gastroenterology Research, ISSN 1918-2805 print, 1918-2813 online, Open Access
Article copyright, the authors; Journal compilation copyright, Gastroenterol Res and Elmer Press Inc
Journal website http://www.gastrores.org

Original Article

Volume 13, Number 1, February 2020, pages 19-24


The Impact of Hospital Teaching Status on Colonoscopy Perforation Risk: A National Inpatient Sample Study

Tables

Table 1. Demographic Characteristics of Patients Who Underwent Colonoscopy Between 2010 and 2014 Stratified by Teaching vs. Non-Teaching Facilities
 
VariablesTotalNon-teachingTeachingP value
SD: standard deviation.
No. of observations, unweighted257,006135,652121,354
No. of observations, weighted1,273,042669,250603,792
Age, mean (SD)68 (15)66 (15)< 0.0001
Sex
  Female, N (%)682,062365,012 (55%)317,050 (53%)< 0.0001
  Male, N (%)590,655304,023 (45%)286,632 (47%)
Race
  White797,383451,028 (72%)346,355 (62%)< 0.0001
  Black215,82285,997 (14%)129,824 (23%)
  Hispanic115,73961,225 (10 %)54,513 (10%)
  Asian27,55713,240 (2%)14,317 (2%)
  Others35,10917,427 (2%)17,682 (3%)
Ulcerative colitis10,2424,869 (7%)5,374(9%)< 0.0001
Crohn’s disease17,6757,870 (1.2%)9,805 (1.6%)< 0.0001
Polypectomy44,91123,134 (3.4%)21,777 (3.6%)0.17
Stricture5,4432,587 (0.4%)2,856 (0.5%)0.002
Insurance
  Medicare808,730440,454 (68%)368,277 (63%)< 0.0001
  Medicaid112,51252,624 (8%)59,888 (10%)
  Private insurance259,139131,034 (20%)128,106 (22%)
  Self-pay/no charge/other55,62326,419 (4%)29,204 (5%)
Elixhauser comorbidity index
  059,21033,157 (5%)26,053 (4%)< 0.0001
  1 - 3346,130188,437 (28%)157,693 (26%)
  ≥ 4867,701447,655 (67%)420,046 (70%)

 

Table 2. Univariate Odds Ratio for Perforation Post-Colonoscopy in Teaching Facilities Compared to Non-Teaching by Logistic Regression Model
 
VariablesCrude odds ratio with confidence intervalP value
Perforation1.17 (1.02 - 1.34)0.02
Age1.00 (0.99 - 1)0.39
Female sex1.29 (1.12 - 1.47)< 0.0001
Ulcerative colitis2.67 (1.67 - 4.28)< 0.0001
Crohn’s disease2.71 (1.9 - 3.85)< 0.0001
Dilatation of stricture6.04 (3.92 - 9.31)< 0.0001
Polypectomy1.13 (0.81 - 1.59)0.47
Race0.88 (0.82 - 0.96)0.005
Insurance
  MedicareReferent
  Medicaid0.81 (0.62 - 1)0.12
  Private insurance1.04 (0.88 - 1.23)0.59
  Self-pay/no charge/other0.78 (0.55 - 1.13)0.196
Elixhauser comorbidity index
  0Referent
  1 - 30.72 (0.54 - 0.96)0.027
  ≥ 40.69 (0.52 - 0.90)0.008

 

Table 3. Multivariate Odds Ratio for Perforation Post-Colonoscopy in Teaching Facilities Compared to Non-Teaching by Logistic Regression Model
 
VariablesAdjusted odds ratio with confidence intervalP value
Teaching1.23 (1.07 - 1.42)0.004
Female sex1.35 (1.16 - 1.56)< 0.001
Ulcerative colitis2.41 (1.46 - 3.97)0.001
Crohn’s disease2.40 (1.65 - 3.51)< 0.001
Dilatation of stricture5.19 (3.21 - 8.39)< 0.001
Race
  WhiteReferent
  African-American0.65 (0.53 - 0.80)< 0.001
  Hispanic0.94 (0.74 - 1.20)0.62
  Asian0.98 (0.62 - 1.56)0.94
  Others0.45 (0.26 - 0.81)0.007
Elixhauser comorbidity index
  0Referent
  1 - 30.76 (0.56 - 1.05)0.10
  ≥ 40.77 (0.57 - 1.04)0.09